163904885 has 8 divisors (see below), whose sum is σ = 200397240. Its totient is φ = 128649664.

The previous prime is 163904861. The next prime is 163904893. The reversal of 163904885 is 588409361.

It can be written as a sum of positive squares in 4 ways, for example, as 65141041 + 98763844 = 8071^2 + 9938^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163904885 - 2¹⁶ = 163839349 is a prime.

It is a super-2 number, since 2×163904885² = 53729622653726450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308990 + ... + 309519.

It is an arithmetic number, because the mean of its divisors is an integer number (25049655).

Almost surely, 2^163904885 is an apocalyptic number.

It is an amenable number.

163904885 is a deficient number, since it is larger than the sum of its proper divisors (36492355).

163904885 is an equidigital number, since it uses as much as digits as its factorization.

163904885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618567.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 163904885 is about 12802.5343194229. The cubic root of 163904885 is about 547.2645276409.

The spelling of 163904885 in words is "one hundred sixty-three million, nine hundred four thousand, eight hundred eighty-five".